Adjusting means for overhanging arms



June 30, 1931. i a. P. GRAVES 1,812,549

ADJUSTING MEANS FOR OVERHANGING ARMS Filed Sept. 11, 1928 understoodfrom a description of Patented June 30, 19 31 "UNITEDSTAQTES PA ENT? orricr.

BENJAMIN r. GnAvnsfor oRAnsron,

RHODE ISLAND, ASSIGNOR T BROWN & SHARPE mANurAcruitmecoMrANY, or PROVIDENCE, nnonr. ISLAND, A; CORPORATION or i iuaonn' 'IsnAND Amusrme MEANS ron ovERHAnGIne ARMS Application filedsepteinber 11, 1928. Serial No; 305,167.

My invention relates to machines having a plurality of overhanging arms particularly to milling machines of a type having a; plurality of overhanging arms adapted to receive a cutter arbor yoke on the outer ends thereof for mountinga cutter arborbetween said yoke and the usual column thereof. So faras I amaware no-one' has heretofore provided in a machine of this type means to 10 adjust. the effective projecting lengths of said overhanging armsv from said machines relative to one another with saidv means being also effective to simultaneously adjust the projecting lengths of both overhanging 1% arms if desired for any purpose, such as to vary the angle at which the cutter: arbor yoke is mounted on the machine, or to adjust the machine for diiferent types of work.

To these ends I provide preferably rotat- 20 able adjusting gear means for each arm' continuously inv mesh with suitably cut rack teeth on each arm and manually operable handle means to actuate said rotatable gear means slidable from a position engaging 18 either one of said rotatable means to actuate to actuate both simultaneouslyi v These and such other'objects of my inven tion as may hereinafter. appear will be best diiferent embodiments thereof, such'as are shown in the accompanying drawings. r

In the drawings, Fig. 1 is a side elevation of the column, the overhanging arms, cutter one independently of the other to a position arbor yoke and cutter arbor of amilling ma chine having my improved overhanging arm adjusting means mounted on the rear thereof. r I

' I Fig; 2 is a transverse sectional View taken through the preferred type of adjusting means I preferably employ.

Fig. 3 is a transverse sectional view similar to Fig. 2 of a modified form of my invention. 1

In the .drawings, wherein like characters of reference indicate like parts throughout,

10 represents the cutter. arbor supporting column of a milling machine having a plurality 10f overhanging arms 12 and 12 adjustably. mounted thereon- The usual arbor yoke 14 is mounted on the front ends of said overhanging arms and contains the usual center 16 for. mounting the cutter arbor 18 on which theusual cutting tool 20 is suitably mounted, the opposite end of the cutter arbor 18 registering with the spindle in the column 10 as usual. As stated, my invention includes employing in a machine, preferably a milling-machine of this type, means mounted on the column to adjust the effective proj ecting length of one overhanging arm from said column and means mounted on said column to adjust the effective projecting length of the other overhanging arm relative to and independently of the adjusting means of said. first overhanging arm, said means being alsoefi'ective to simultaneously adjust the projectinglengths of both overhanging arms.

.To actuate said means-I preferably employ manually operable'handle means such as the handle 22 slidable from a position engaging either one of said arm actuating means to actuate either one independently of the other to a position engaging both to actuateboth arm actuating means simultaneously. Said adjusting means is preferably as shown in Fig. 1- suitably mounted in a bearing 24 at the rear of the machine. While any type of adjusting means may be employed, I preferably form the rack teeth 26 and 26' respectively onthe overhanging arms 12 and 12 and I provide the rotatable gear means 28 and 28 respectively adapted to engage said rack teeth to move said arms. In the embodiment shown in Figs. 1 and 2 I preferably provide the transverse bearing bore 30 in the bracket 24 extending in one direction a considerable distance to the 'side of the machine as at 31. In this embodiment, the

rotatable gear means 28 and 28 the toothed shafts 28 and 28 respectively. I provide the sleeve shaft 28 having the hexagonal reduced outer end 32 projecting from said bore having its opposite end toothed as at 34 to engage the rack teeth 26 on the adjacent overhanging arm and I provide the shaft 28 having the inner toothed end 34 to engage the rack teeth 26 on the adjustable overhanging arm 12", a reduced portion 36 projecting through said sleeve shaft bore 38 and terminating in an enlarged hexagonal end 40 beyond said sleeve shaft end 32 of substantially the same diameter as that of the projecting sleeve shaft end 32. In the embodiment shown, the shaft 28 is provided with a central portion 42 of larger diameter than the sleeve shaft contained portion 36 to form a shoulder 44 to limit the inward movement of the sleeve shaft.

To prevent the sleeve shaft 28 from outward movement within said bore 30 I provide the adjusting screw 46 adapted to register in a circumferential groove 48 cut in the outer periphery of the sleeve shaft 28*. The actuating handle 22 for said shafts is provided with a collar 50 of substantially the same internal size as the interior of the respective ends 32 and 40 and is manually slidable from a position engaging the projecting end 32 of the sleeve shaft 28 to adjust the projecting length of the overhanging arm 12 through the medium of the gear means shown to a position engaging the procomprise jecting end 40 of the shaft 28' to adjust the projecting length of the other overhanging arm l2 on due rotation of the handle 22.

The embodiment shown in Fig. 3 illustrates an alternative form of adjusting means which may be employed. In this case the rotatable adjusting gear means for each respective arm 12 and 12 consists of the shafts 28 and 28" each having mounted on the outer ends thereof the gears 52 and 52 respectively, provided with the teeth 34: and 34 to engage the rack teeth 26 and 26 respectively and are provided on their opposite ends preferably centrally of the bearing 24 with the gears 54: and 54". In this case, the manually operable handle means 22 has the collar 50 thereof firmly attached to the slidable shaft 56 on the inner end of which is located the wide gear 58. It is thus obvious that on moving the handle 22 and attached shaft 56 transversely of the bearing 24 that the gear 58 is slidable from a position engaging the gear 54 to adjust through the medium of the gear 52 and rack teeth 26 the effective projecting length of the overhanging arm 12 from the column 10 independently of the adjustment of the overhanging arm 12 to a position engaging the gears 54: and 54 simultaneously to adjust through the medium of the gears 52 and 52 and rack teeth 26 and 26' the effective projecting lengths of the overhanging arms 12 and 12 and to a position to engage the gear 54 alone to adjust through the medium of the gear 52 and rack teeth 26 the effective projecting length of the overhanging arm 12 from the column 10 independently of the overhanging arm l2 on due manual rotation of the handle 22. Though I have shown a machine employing two overhanging arms only, it is obvious that any desired number may be employed.

It is understood that my invention is not limited to the specific embodiments shown and that various deviations may be shown without departing from the spirit and scope of the appended claims.

NVhat I claim is:

1. In a milling machine, a column, two parallel horizontally disposed overhanging arms adapted to receive a cutter arbor yoke on the front end thereof for mounting a cutter arbor between said yoke and column having rack gear teeth formed thereon on a portion thereof normally contained within the column, a transverse bearing bore in said column adjacent said gear teeth, a sleeve shaft having a reduced end projecting from said bore and the opposite end toothed to engage the rack teeth on the adjacent overhanging arm, a shaft having a toothed end to engage the rack teeth on the further overhanging arm, a portion projecting through said sleeve shaft bore and terminating in an end beyond said sleeve shaft end of substantially the same diameter as that of the projecting sleeve shaft end and a central portlon of larger diameter than the sleeve shaft contained portion to form a shoulder to prevent inward movement of the sleeve shaft and an actuating handle for said shafts slidable from a position engaging the end of the sleeve shaft to adjust the projecting length of one overhanging arm to a position engaging both the end of the shaft and the sleeve shaft to adjust the proj ecting lengths of both overhanging arms together and to a position engaging the projecting end of the shaft to adjust the projecting length of the other overhanging arm.

2. In a milling machine, a column, two overhanging arms adapted to receive a cutter arbor yoke on the front end thereof for mounting a cutter arbor between said yoke and column having rack gear teeth formed thereon on a portion thereof normally contained within the column, a bearing bore in said column adjacent said gear teeth, a sleeve shaft having an end projecting from said bore and the opposite end toothed to engage the rack teeth on the adjacent overhanging arm, a shaft having a toothed end to engage the rack teeth on the further overhanging arm, a portion projecting through said sleeve shaft bore and terminating in an end beyond said sleeve shaft end of substantially the same diameter as the projecting sleeve shaft end and an actuating handle for said shafts slidable from a position engaging the end of the sleeve shaft to adjust the projecting length of one overhanging arm to a position engaging both the end of the shaft and the sleeve shaft to adjust the projecting lengths of both overhanging arms together and to a position engaging the projecting end. of the shaft to adjust the projecting length of the other overhanging arm.

In testimony whereof I afiix my signature.

BENJAMIN P. GRAVES. 

